TextformatterLiteYouTubeEmbed.module

<?php

/**
 * ProcessWire Lite YouTube Embed Module
 *
 * Adapted from Ryan Cramer's TextformatterVideoEmbed:
 * https://github.com/ryancramerdesign/TextformatterVideoEmbed
 *
 * This module replaces plain YouTube links pasted in a CKEditor field
 * with Paul Irish's blazing fast embed script:
 * https://github.com/paulirish/lite-youtube-embed
 *
 * So for example the following links…
 * https://youtu.be/z_DwA8We7pI
 * https://www.youtube.com/watch?v=5UAFdL8N91U
 * https://www.youtube.com/?v=ucmU2nbCVI8
 *
 * …will be converted to:
 * <lite-youtube videoid='z_DwA8We7pI'></lite-youtube>
 * <lite-youtube videoid='5UAFdL8N91U'></lite-youtube>
 * <lite-youtube videoid='ucmU2nbCVI8'></lite-youtube>
 *
 * Note: you need to include the lite-youtube-embed stylesheet and script yourself
 */

class TextformatterLiteYouTubeEmbed extends Textformatter
{
    public static function getModuleInfo()
    {
        return array(
            'title'     => __('Lite YouTube Embed'),
            'version'   => 101,
            'summary'   => __("Replaces plain YouTube links in a CKEditor field with Paul Irish's faster YouTube embed script."),
            'author'    => 'jacmaes',
        );
    }



    /**
     * Format the input string
     *
     * @param string $str The block of text to parse
     *
     * The incoming string is replaced with the formatted version of itself.
     **/


     public function format(&$str) {


       /**
        * 1. Find YouTube video links pasted on a single paragraph line, i.e.
        * <p>https://www.youtube.com/watch?v=adssasw9WgX</p>
        **/

        // a) perform a quick check before moving on to the more expensive regex in b)
        if(strpos($str, '://www.youtube.com/watch') === false
         && strpos($str, '://www.youtube.com/v/') === false
         && strpos($str, '://youtu.be/') === false) return;

       // b) regex to find YouTube link in a paragraph
       $regex = '#<p>\s*(https?://(?:www\.)?youtu(?:.be|be.com)+/(?:watch/?\?v=|v/)?([^\s&<\'"]+))(&[-_,.=&;a-zA-Z0-9]*)?.*?</p>#';

       if(!preg_match_all($regex, $str, $matches)) return;


       /**
        * 2. Loop through YouTube videos, find id, then replace paragraph with lite-youtube
        *
        **/

         foreach($matches[0] as $key => $line) {

          // Alternative regex that also allows to find video ID:
          // https://gist.github.com/ghalusa/6c7f3a00fd2383e5ef33
          // preg_match('%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/// )([^"&?/ ]{11})%i', $line, $match);
          // $video_id = $match[1];

         // Find video ID
         $video_id = $matches[2][$key];

         $str = str_replace($line, "<lite-youtube videoid='$video_id'></lite-youtube>", $str);
       }



      }
    }